Double-drum hoist



'H. W. MAHGE W DOUBLE DRUM uoxs'r ept W25 Film m 31, mm

INVENTOR ywflvm' if HE TO'RN Ilill end thereofandwnuts Patented Sept. 22, 1925.

UNITED STATES PATENT OFFICE.

nanny v. HAIGHT, or snnmmooxe, on'ranro, mama, assrenon. 'ro meansommun comrnw, or mnsnv crrm vnw JERSEY, A come-narrow or new mnsnv.

DOUBLE-DRUM E0181.

Application filed Kay 81,

a citizen of the Dominion of Canada, and

a resident of Sherbrooke, Province of Quebee, Canada, have invented a certainDouble- Drum Hoist, of ,which the following is a specification accompanied by drawings.

This invention relates to hoists, but more particularly to an improved clutch mechanism for a double drum 'hoist, whereby one or the other of the drums may be driven in accordance with the direction of rotation of the motor.

The objects of this invention are to produce an improved clutch mechanism for a double drum hoist and to "enable the clutch to be positively moved into engagement with one or the other of the drums in accordance with the direction of rotation of the, motor.-

Further objects of the invention will hereinafter appear and the invention is shown vation of a double drum hoist.

Referring to the drawings, A designates the base .plate of the hoist on which end frames B are mounted. A'shaftC is in this instance mounted in the end frames B and suitable bushings D may'be interposed between the shaft C and the end frames B for taking up wear. An internal gear E is preferably keyed to "the shaft G and is in this instance enclosed in'a suitable housing- -F.' A driving pinion'G meshes with the internal gear E and is mounted on the shaft H which is driven by the motor J The motor J is-shown as an electric motor'mounted'on a suitable base K, although it is to be under stood that anysuitable type of motor may be employed without departing from the spirit of the invention. The shaft 0 is inthis instance formed with. screw: threads L on which are screwed nutsO which are adapted to prevent longitudinal movement of the internal gear E in one direction.

A pair of flanged drums P and Q are in this instance rotatable about the shaft C and cables 1% and Sara wound about the drums P and Q respectively. A, thrust washer T' islocated between "the drfim' P and internal :gean-E andthe shaft, G is formed with screw threads U adjacent one re screwed. onto reve in mi" the screw 'threadiQg-U fo 1924. Serial No. 718,870.

tudinal movement of the drum Q in one direction. The thrust washer 'W ma mounted between one of the nuts V an the drum Q. The shaft C is preferably formed with suitable lubricant passages X into which lubricant from the cups Y, located at the opposite ends of the shaft C, maybe 9 forced for distributing lubricant to the drum bearings. The drums P and Q, are prefer- ..ably formed with opposed flanges Z and a respectively and, if desired, suitable brakes not shown) may operativelyengage these anges. The

are cut away to form friction surfaces 12 inner faces of the flanges Z and a and a'respectively. A spiral gear d is in this instance formed on the shaft 0 and a main driver e engages the spiral gear d.

The main driver 6 is in this instance in the form of a' wheel of substantially the same diameter as the drums and a suitable friction ring f which may be of wood isconnected to the outer periphery of the wheel by the countersunk bolts g and nuts 7 h. The friction ring 7 is cut away at the opposite sides forming friction faces jand k at each side which are adapted to frictionally engage. the friction surfaces 0 and b res ectitely on the drum flanges a' and Z.

n the operation of the hoist so far described, rotation of the motor J will be transmitted to the internal gear E by means of the inion G and the, shaft 0 'willaccording ybe rotated in-the' same direction. Rotation of the shaft 0 will cause the spiral (gear at to move the main driver e longituinally relativeto the shaft 0 so that the friction faces j and k on the friction ring f will engage one or the other of the opposed friction surfaces 0 and b on, the drum flanges Z and a respectively according to the direction of rotation of the shaft C. 7 In this manner one drum or the other will be driven according to thev direction of rota= tion of the motor J, and the other drum is free to rotate about the shaft. The spiral gear don the shaft C creates a thrust to move the *main driver 0 longitudinally relai tive to the shaft C and thereby force the friction surfaces 1' and]; on the friction ring f into engagement with one or ,-the other of the friction, surfaces 0 and b respectively. In this manner one of the drums P 'and'Q may be drivif'tto wind one'of the cables on its mspectiv-7d"' and the cable on the other drum may be freely unwound. In this manner, if a continuous cable is eml ployed and a scoop connected to the cable one of the drums, the scoopwill with the direction of rotation of the shaft 0 and as long as theJshaft C is operatively connected to the motor J;

Although one embodinient of my inventionis shown on the drawing, it is to be understood-that this invention isonly limited to the scope of the appended claim and departure may be made from the actual construction shown on the drawing without departing from the spirit of the invention.

. a f a v I clalm. 7

s' In a double arm hoist the combination I wh n of a shaft, a, reversible motor connected to drive said-shaft, two independent flanged drums adapted to rotate about said shaft in relatively fixed longitudinal relationship,

of substantially the same diameter as the drums in engagement with said spiral gear and bodily 'movable longitudinally of the shaft, and friction surfaces at each side of the periphery-of said main driver, said s i ral gear being adapted to automatica 1y move one or the other of the said friction surfaces on the main driver into engagement with one or the other of the frlction surfaces on the said drum flanges in accordance with the-direction of rotation of the motor, whereby'one drum or the other will be actuated, While permitting the free drum to rotate'in either" direction at will.

In testimony whereof I'have signed this" specification.

HARRY v. HAIGHT, 

